add digital out to Technics SL-PG 200

capslock · 7th April 2007, 05:46 AM

I need to add a digital out to above player. The same PCB is apparently used for the 400 and 500 models which have a digital out.

I have located the datasheet of the decoder
http://www.datasheetcatalog.com/data...6/MN6626.shtml

but it is more than basic.

Does anybody know if the dig out is disabled / enabled by software as in most Philips chipsets?

Why would the digital output interface on the chip have an input named MEMP?

Thanks

stephensank · 9th April 2007, 03:54 AM

The datasheet does not seem to show anything that I could identify as an enable/disable pin. I would bet that the "TX" pin is sitting there outputting SPDIF signal waiting to be used. Try connecting it to an output jack, with a 75ohm(50-100ohm is near enough) in between & the jack grounded to the main board & see if connecting it to a DAC unit produces music. Probably will.

capslock · 9th April 2007, 08:22 PM

Well, with most Philips decoders, the output is software controlled, but I might give it a try.

stephensank · 10th April 2007, 02:24 AM

I seem to recall adding an SPDIF out to a player with this same Panasonic decoder chip & not needing to enable the pin. It's not unusual, really.

capslock · 17th April 2007, 11:59 AM

I checked with a scope, without even taking out the PCB, just by sticking the probe into a hole for a non-existant resistor that had the label "SL-PG 400/500 only" printed nearby, and yes, the output seems to be happily chattering to itself.

I then inserted a resistor into that hole and by heating from above, got it soldered into that very hole.

Now, the player refuses to read the disks

I doubt I killed the decoder though electrostatic discharge, because I am always careful to toucht the chassis first, so I will have to check whether a solder blob formed on the lower side of the PCB.

capslock · 17th April 2007, 09:19 PM

Took out the PCB - no solder blob, but also no supply decoupling near the decoder to speak of. Reconnected, still not playing. Considered cleaning the bearing of the CDM4 swing arm but decided to play with the focus adjust first. Giving the pot a 2° random twist while trying to find the right hex bit did the job!

stephensank · 18th April 2007, 04:23 AM

It sounds like you are saying you got it working again, but I am not quite sure. In any case, very weird behaviour which suggests to me that you should check for cracked/suspicious looking solder connections on the entire PCB. Look particularly around heat-generating parts, such as voltage regulators and large resistors, and on connector pins.

mootzeroni · 2nd May 2010, 04:48 PM

Quote:

Originally Posted by capslock

Took out the PCB - no solder blob, but also no supply decoupling near the decoder to speak of. Reconnected, still not playing. Considered cleaning the bearing of the CDM4 swing arm but decided to play with the focus adjust first. Giving the pot a 2° random twist while trying to find the right hex bit did the job!

Did you get a square wave signal? How did it look/sound? Curious, as i have a SL-PG100 in the garage with the same chip. Before i plug-in the soldering pencil, just wanted to know your general results.

7th April 2007, 05:46 AM	#1
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	add digital out to Technics SL-PG 200 I need to add a digital out to above player. The same PCB is apparently used for the 400 and 500 models which have a digital out. I have located the datasheet of the decoder http://www.datasheetcatalog.com/data...6/MN6626.shtml but it is more than basic. Does anybody know if the dig out is disabled / enabled by software as in most Philips chipsets? Why would the digital output interface on the chip have an input named MEMP? Thanks

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9th April 2007, 03:54 AM	#2
stephensank diyAudio Member Join Date: Oct 2006	The datasheet does not seem to show anything that I could identify as an enable/disable pin. I would bet that the "TX" pin is sitting there outputting SPDIF signal waiting to be used. Try connecting it to an output jack, with a 75ohm(50-100ohm is near enough) in between & the jack grounded to the main board & see if connecting it to a DAC unit produces music. Probably will.

9th April 2007, 08:22 PM	#3
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	Well, with most Philips decoders, the output is software controlled, but I might give it a try.

10th April 2007, 02:24 AM	#4
stephensank diyAudio Member Join Date: Oct 2006	I seem to recall adding an SPDIF out to a player with this same Panasonic decoder chip & not needing to enable the pin. It's not unusual, really.

17th April 2007, 11:59 AM	#5
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	I checked with a scope, without even taking out the PCB, just by sticking the probe into a hole for a non-existant resistor that had the label "SL-PG 400/500 only" printed nearby, and yes, the output seems to be happily chattering to itself. I then inserted a resistor into that hole and by heating from above, got it soldered into that very hole. Now, the player refuses to read the disks I doubt I killed the decoder though electrostatic discharge, because I am always careful to toucht the chassis first, so I will have to check whether a solder blob formed on the lower side of the PCB.

17th April 2007, 09:19 PM	#6
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	Took out the PCB - no solder blob, but also no supply decoupling near the decoder to speak of. Reconnected, still not playing. Considered cleaning the bearing of the CDM4 swing arm but decided to play with the focus adjust first. Giving the pot a 2° random twist while trying to find the right hex bit did the job!

18th April 2007, 04:23 AM	#7
stephensank diyAudio Member Join Date: Oct 2006	It sounds like you are saying you got it working again, but I am not quite sure. In any case, very weird behaviour which suggests to me that you should check for cracked/suspicious looking solder connections on the entire PCB. Look particularly around heat-generating parts, such as voltage regulators and large resistors, and on connector pins.